Layer Estimates:

Layer: Through the Civil War (1830-1865) (ID:0)
Count: 488
Extent:

XMin: -13552626.7062
YMin: 3324421.0515
XMax: -7503397.7637
YMax: 5868252.5052
Spatial Reference: 102100 (3857)

Layer: 1866-1880 (ID:1)
Count: 17
Extent:

XMin: -13704365.8751
YMin: 2986031.1592
XMax: -7506001.4943
YMax: 6074014.4303
Spatial Reference: 102100 (3857)

Layer: 1881-1900 (ID:2)
Count: 6
Extent:

XMin: -13833869.758
YMin: 2972027.5731
XMax: -7545357.5553
YMax: 6275272.5049
Spatial Reference: 102100 (3857)

Layer: 1900 and later (ID:3)
Count: 3
Extent:

XMin: -13827754.964
YMin: 2820533.5523
XMax: -7456622.1422
YMax: 6274995.1244
Spatial Reference: 102100 (3857)